SEOUL, March 28 (Yonhap) -- The South Korean government said Wednesday that all products with genetically modified organisms (GMOs) must be clearly labelled as such under a plan to enhance consumer rights.

The plan, which goes into effect on June 29, is an expansion of current identification requirements designed to protect the environment and consumer health. Under the current rules, it is only mandatory to identify genetically modified beans, bean sprouts, corn and potatoes.

Products containing GMOs, which have been artificially transformed in labs to improve output, taste and resistance to disease, have drawn criticism over their possible adverse effects on the ecosystem and human health.

"The changes call for all GMO products that are imported and manufactured for human consumption to be labelled," said Kim Young-man, head of the Agriculture Ministry's agriculture distribution bureau.

To encourage enforcement of the new rules, the official said people who report mislabeling will be given cash rewards of up to 2 million won (US$2,130).

Kim stressed that the move is not aimed to hurt imports of GMO products from such countries as the United States, and speculated that it will not cause complaints.

"The actions are not new and are only an expansion of existing procedures," he said.

In addition to GMO products, the ministry said it will start a nationwide probe to ferret out mislabeling of fresh and processed agricultural goods starting on April 1.

The latest actions are to cover both fresh produce like melons, watermelons, strawberries and peaches as well as manufactured products including bread, noodles and curry.

Because of higher prices and stronger consumer demand, some importers and retailers have intentionally mislabeled cheap imports as being produced in the country.

The ministry said those found to have tried to mislead consumers could face a fine of under 100 million won or a jail term of less than seven years.